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Commitments and Contingencies - Other Loss Contingencies (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Sep. 12, 2014 | Apr. 30, 2013 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |  |  |
Long-term indemnification assets |  |  | $ 116,944 |  | $ 98,493
UAM Brazil |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent |  | 49.00% |  |  |
Brazil |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible contingency loss |  |  | 46,000 |  |
Pending Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Contingent liabilities recorded |  |  | $ 60,000 |  | 22,000
Taxes, Other-Than-Income Tax |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, statues of limitations |  |  | 10 years |  |
Taxes, Other-Than-Income Tax And Indemnification Assets |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Increases/(decreases) to operating income for adjustments to non-income tax contingencies and indemnification assets |  |  | $ (2,121) | $ (4,037) |
Income Tax Contingencies |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Contingent liabilities recorded |  |  | 64,380 |  | 100,404
Guarantee of Indebtedness of Others | Chile |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, noncurrent |  |  | 33,575 |  | 27,073
Guarantee amount, maximum potential amount of payments |  |  | 545,000 |  | 527,000
Guarantee Obligations |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Percent of shares of company acquired in a business combination, used as a guarantee |  | 49.00% |  |  |
Other Noncurrent Liabilities | Taxes, Other-Than-Income Tax |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, noncurrent |  |  | 76,112 |  | 74,318
Other Current Liabilities | Taxes, Other-Than-Income Tax |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, current liability |  |  | $ 142 |  | $ 138
Repayment Guarantee For Loans That Financed A Portion Of The Purchase Price |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Percentage of shares as guarantee of payment obligations | 75.00% |  |  |  |
Repayment Guarantee For Obligations Under The Purchase Agreement For The Seller Notes |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Percentage of shares as guarantee of payment obligations | 25.00% |  |  |  |

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- Definition The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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